CN105185370B - A kind of sound masking door - Google Patents
A kind of sound masking door Download PDFInfo
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- CN105185370B CN105185370B CN201510484967.6A CN201510484967A CN105185370B CN 105185370 B CN105185370 B CN 105185370B CN 201510484967 A CN201510484967 A CN 201510484967A CN 105185370 B CN105185370 B CN 105185370B
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Abstract
A kind of sound masking door, including sheltering door main body, it further include moveable sound source acquisition attachment, the sound source acquisition attachment includes the first sound acquisition module, the first radio receiving transmitting module and the first digital signal processing module being connected with the first sound acquisition module and the first radio receiving transmitting module；The sound masking door main body include towards on the inside of door-plate or doorframe the second radio receiving transmitting module, towards the masking sound generation module on the outside of door-plate or doorframe, and the second digital signal processing module being connected with said two devices.Present invention employs the modes of wireless transmission, realize the mobility of sound acquisition module, can flexibly acquire sound-source signal, solve the defect of existing sound masking system acquisition sound-source signal effect difference.The good acquisition of sound-source signal can increase the correlation between sound masking signal and sound-source signal, reach better masking effect.
Description
Technical field
The invention belongs to electronic fields, are related to a kind of anti-eavesdrop equipment, and in particular to a kind of sound masking door.
Background technique
In the epoch of this information explosion, the privacy of voice is had been to be concerned by more and more people, and is especially done some
Public room, meeting room, laboratory, negotiation place etc. are related to the secrecy place of voice messaging safety.However as the development of science and technology, surreptitiously
Listen technology also more and more diversified, for example, telephone tapping, microwave eavesdropping, laser eavesdropping, data eavesdropping, shotgun microphone eavesdropping,
Pipeline eavesdropping etc..For the Eavesdropping of various ways, also there are various anti-eavesdrop means.
Anti-eavesdrop means are broadly divided into two kinds at this stage: absorbing isolation method harmony masking method.Absorbing isolation method is using structure
The method of sound insulating structure is built to realize anti-eavesdrop.The biggish material of some acoustic absorptivities and structure are commonly used in engineering to absorb sound
Information, or acoustic information is confined to segment space range using some partiting sound members.But be limited to cost, engineering process level etc.
The requirement of shelter for preventing personal information from revealing by sound approach is also much not achieved in the factor of aspect, the method.Sound masking method
It is a kind of anti-eavesdrop means using principle of acoustic masking newly risen.The prior art is usually at the sound leakage such as door, window, wall
The device for applying masking sound is set.There are four types of existing masking sound types: meaningless steady-state noise, language spectral noise, speech like sound
Noise, natural phonation and compound voice.Meaningless steady-state noise, language spectral noise and natural phonation all do not have correlation with sound-source signal,
The efficiency of masking is relatively low, so masking sound needs very big energy that could reduce the intelligibility of language message, but too strong makes an uproar
Sound will affect the normal work life of people.And the speech like sound masking sound and sound-source signal obtained by sound-source signal by processing it
Between have correlation, masking efficiency is higher, be better than other masking sounds.
Fig. 1 is a kind of existing sound masking device, including sound source acquisition module, data processing module and masking sound generate
Module, data processing module are connected with sound source acquisition module and masking sound generation module respectively.It is in an authorized announcement date
On August 15th, 2012,202383998 U of Authorization Notice No. CN, the Chinese utility model of entitled " a kind of sound masking system "
A kind of sound masking system that data processing module is connected with sound source acquisition module and masking sound generation module respectively is proposed in patent
System.But such system, there are obvious shortcoming, sound source acquisition module is connected with data processing module and masking sound generation module, with
Entire sound masking system is rigidly mounted together at the sound leakage such as door, window, wall, cannot flexibly acquire sound-source signal.Such as when
When sounder is back to sound source acquisition module, sound source acquisition module cannot acquire sound source well, for another example when sound source is apart from sound masking
System farther out when, sound source acquisition module is also difficult preferably to collect sound source, generates corresponding masking sound to be not achieved to cover
Cover the effect of sound source.Existing masking acoustic device is mostly to apply masking sound in protected area, inevitably influences people's in this way
It works normally.In addition, masking acoustic device is mostly individually to add device, occupied space influences beauty, advises against space whole design
It draws.Therefore, sound masking system is up for further improving and developing.
Summary of the invention
In order to solve, existing sound masking system cannot flexibly acquire sound-source signal, masking sound influences people in protected area
The defect of normal work, and space whole design planning needs are catered to, the present invention devises a kind of sound masking door.
Sound masking door of the present invention, including sound masking door main body further include moveable sound source acquisition attachment, the sound
Source acquire attachment include the first sound acquisition module, the first radio receiving transmitting module and with the first sound acquisition module and the first nothing
The first digital signal processing module that line transceiver module is connected；
The sound masking door main body include towards on the inside of door-plate or doorframe the second radio receiving transmitting module, towards door-plate or door
The masking sound generation module of outer frame side, and be connected with above-mentioned second radio receiving transmitting module and masking sound generation module second
Digital signal processing module；
First sound acquisition module emits the voice signal of acquisition by the first radio receiving transmitting module, the second wireless receiving and dispatching
Module receives the voice signal of the first radio receiving transmitting module transmitting and generates masking sound by the second digital signal processing module
Electric signal transmission gives masking sound generation module；Masking sound generation module shelters acoustoelectric signal based on the received and generates masking sound.
It preferably, further include the second sound acquisition module being connect with the second digital signal processing module, second number
Word signal processing module receives the voice signal of second sound acquisition module acquisition, and is controlled according to the sound signal intensity of acquisition
The intensity of masking sound generation module generation sound masking signal.
Further, second digital signal processing module receives the voice signal of second sound acquisition module acquisition,
And the second radio receiving transmitting module is passed through to the first radio receiving transmitting module emissioning controling signal, control according to the sound signal intensity of acquisition
Whether sound source acquisition attachment processed works.
Further, which is characterized in that sound acquisition module includes microphone, sound pick-up or the filter being linked in sequence, the
The output end of one ADC and speech coder, institute's speech encoder connects digital signal processing module.
Preferably, the radio receiving transmitting module includes transmitting path and receiving path, the transmitting path and receiving path
Including common antenna and the duplexer being connect with antenna.
Further, the transmitting path further includes the first DAC and the first frequency mixer, and first mixer output connects
Duplexer is connect, the first DAC input terminal connects digital signal processing module, and the output end connection first of the first DAC is mixed
The input terminal of frequency device.
Further, the receiving path further includes the 2nd ADC and the second frequency mixer, the output for receiving the 2nd ADC
End connection digital signal processing module, the input terminal of second frequency mixer connect duplexer, the output of second frequency mixer
The input terminal of the 2nd ADC of end connection.
Preferably, the masking sound generation module includes the Voice decoder being linked in sequence, the 2nd DAC, power amplifier
And loudspeaker, the input terminal of Voice decoder connect the second digital signal processing module.
Preferably, second digital signal processing module is according to the first sound received from the second radio receiving transmitting module
The sound-source signal of acquisition module acquisition generates the detailed process of masking acoustoelectric signal are as follows:
Step 1: obtained voice signal is obtained into target sound source signal by pretreatment；The pretreatment includes: voice
Enhancing, noise reduction, auditory localization and sound characteristic identification；
Step 2: the target sound source signal that step 1 is obtained carries out framing by preset time window length, according to；
Sound masking signal is obtained after the time reversal for carrying out time domain to each frame signal.
Preferably, the sound masking door have following characteristics at least one:
A. the sound acquisition module is realized using TLV320AIC23；
B. the digital signal processing module is realized using TMS320VC5509；
C. the radio receiving transmitting module is nRF240l chip and the antenna connecting with nRF240l chip.
The beneficial effects of the present invention are:
(1) since the transmission of sound-source signal between the first sound acquisition module in this system and masking sound generation module uses
The mode of wireless transmission, realizes the mobility of the first sound acquisition module, can flexibly acquire sound-source signal, solve
The defect of existing sound masking system acquisition sound-source signal effect difference.It can increase related between sound masking signal and sound-source signal
Property, reach better masking effect.
(2) sound masking door main body contains second sound acquisition module, can monitor in real time and pass to sound-source signal outdoors
Intensity reduces unnecessary work whether controlling its work so as to send control signal in real time to sound source acquisition attachment
Time reduces the noise applied to outdoor environment.
(3) sound masking door main body is integrated with the second radio receiving transmitting module, masking sound generation module, second sound acquisition module
And second digital signal processing module, so that covering appts is combined together with indoor existing facility, caters to space whole design
Planning needs, and realizes the combination of utility function and beauty.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing sound masking system；
In Fig. 2, left-half a is the sound masking door inside structure schematic diagram that modules are integrated on door-plate；Right side
Dividing b is the sound masking outer side of door structural schematic diagram that modules are integrated on door-plate；
In Fig. 3, left-half a is the sound masking door inside structure schematic diagram that modules are integrated on doorframe；Right side
Dividing b is the sound masking outer side of door structural schematic diagram that modules are integrated on doorframe；
Fig. 4 is a kind of specific embodiment schematic diagram that sound source acquires attachment；
Fig. 5 is a kind of specific embodiment schematic diagram that sound source acquires each module in attachment；
Fig. 6 is a kind of specific embodiment schematic diagram of each module in sound masking door main body；
Fig. 7 is that sound masking signal generates process schematic；
Fig. 8 is a kind of specific embodiment schematic diagram that sound source acquires that accessory hardware is realized；
Fig. 9 is a kind of hard-wired specific embodiment schematic diagram of sound masking door main body.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in further detail.
Sound masking door of the present invention, including sound masking door main body further include moveable sound source acquisition attachment, the sound
Source acquire attachment include the first sound acquisition module, the first radio receiving transmitting module and with the first sound acquisition module and the first nothing
The first digital signal processing module that line transceiver module is connected；
The sound masking door main body include towards on the inside of door-plate or doorframe the second radio receiving transmitting module, towards door-plate or door
The masking sound generation module of outer frame side, and be connected with above-mentioned second radio receiving transmitting module and masking sound generation module second
Digital signal processing module；
First sound acquisition module emits the voice signal of acquisition by the first radio receiving transmitting module, the second wireless receiving and dispatching
Module receives the voice signal of the first radio receiving transmitting module transmitting and generates masking sound by the second digital signal processing module
Electric signal transmission gives masking sound generation module；Masking sound generation module shelters acoustoelectric signal based on the received and generates masking sound.
First sound acquisition module 4_1 obtains the acoustic information at the scene of being monitored, and analoging sound signal is converted to number
Digital signal is encoded and is sent to the first digital signal processing module 5_5 by signal.
The first digital signal processing module 5_5 is to the first sound acquisition module 4_1 and the first radio receiving transmitting module 4_3
Initialization and corresponding configuration are carried out, makes its collaborative work, the first digital signal processing module is used to save preset sound simultaneously
It arbitrarily downgrades intensity value, and is compared according to the acoustic information that the first sound acquisition module 4_1 is sent with preset sound pressure level strength value
Compared with, judge whether to masking sound acquisition module emit signal.The first radio receiving transmitting module 4_3 will be from the first number letter
Number processing module signal is sent to the second radio receiving transmitting module 2a_1, while receiving the control from the second radio receiving transmitting module 2a_1
Signal processed.
The second digital signal processing module 2b_2 is to the second radio receiving transmitting module 2a_1 and masking sound generation module 2b_
1 carries out initialization and corresponding configuration, realizes the algorithm for generating masking acoustoelectric signal, and the masking acoustoelectric signal of generation is transmitted
Masking sound generation module is given, masking sound generation module generates masking sound, and the masking sound of generation and the sound-source signal passed to outdoors are folded
After adding, decline sound-source signal intelligibility sharply, to reach masking effect.
The present invention further discloses a kind of preferred embodiment, the sound masking door main body further includes believing with the second number
Number processing module connection and towards the second sound acquisition module on the outside of door-plate (or doorframe), the second Digital Signal Processing mould
Block receives the voice signal of second sound acquisition module acquisition, and controls masking sound according to the sound signal intensity of acquisition and generate mould
The intensity of block generation sound masking signal.Second digital signal processing module can save preset sound pressure level strength value, according to
The acoustic information that two sound acquisition module 2b_3 are sent is compared with preset sound pressure level strength value, and control masking sound generates mould
Whether block 2b_1 generates sound masking signal, it is assumed for example that people's one's voice in speech is smaller within doors or speaker's range gate farther out, pass
It is small to be delivered to intensity of sound at sound masking door main body, even if not generating masking sound, personnel are also impossible to hear outdoors, then the second number
Signal processing module can control the masking sound intensity that masking sound generation module generates it and reduce or not work even, to drop
Low-power consumption.
Following functions can also be realized using second sound acquisition module, if the sound that second sound acquisition module 2b_3 is sent
Message breath is lower than preset sound pressure level strength value, and the second digital signal processing module controls the second radio receiving transmitting module 2b_1 to the
One radio receiving transmitting module emits signal, so that sound source is acquired attachment break-off, to reduce system power dissipation；Meanwhile first number letter
Number processing module judges whether to receive the control signal from sound masking door main body, and controls the first sound acquisition module 4_1
Whether work.
As shown in figure 4, the moveable sound source that sound masking door of the present invention includes acquires attachment and such as Fig. 2 a, 2b institute
The show or sound masking door main body as shown in Fig. 3 a, 3b.Moveable sound source acquisition attachment is integrated with the first sound acquisition module
4_1, the first radio receiving transmitting module 4_3 and it is connected with the first sound acquisition module 4_1 and the first radio receiving transmitting module 4_3
First digital signal processing module 4_2；Sound masking door main body is integrated with towards the second wireless receiving and dispatching on the inside of door-plate (or doorframe)
Module 2a_1(or 3a_1), towards masking sound the generation module 2b_1(or 3b_1 on the outside of door-plate) and second sound acquisition module
2b_3(or 3b_3), and be embedded in the second digital signal processing module 2b_2(being connected inside door-plate with above-mentioned three or
3b_2).
Fig. 5 provides a kind of specific embodiment of first sound acquisition module, the first sound acquisition module 4_1
Microphone 5_1, sound pick-up/filter 5_2, the first ADC5_3 and speech coder 5_4 including sequential connection, speech coder
The output end of 5_4 connects the input terminal of the first digital signal processing module 5_5.Wherein, the first sound acquisition module passes through microphone
5_1, sound pick-up/filter 5_2 obtain the acoustic information at the scene of being monitored, and convert analoging sound signal by the first ADC5_3
At digital signal, then digital signal is encoded by speech coder 5_4 and is sent to the first digital signal processing module
5_5。
The first digital signal processing module 5_5 is used to save preset sound pressure level strength value, and according to the first sound
The acoustic information that acquisition module 4_1 is sent is compared with preset sound pressure level strength value, judges whether to acquire mould to masking sound
Block emits signal；Judge whether to receive the control signal from sound masking door main body, and controls the first sound acquisition module 4_1
Whether work；In addition, also to carry out initialization and corresponding to the first sound acquisition module 4_1 and the first radio receiving transmitting module 4_3
Configuration, make its collaborative work.
Fig. 5 gives a kind of specific implementation of first radio receiving transmitting module, first radio receiving transmitting module
The transmitting path and receiving path of 4_3 includes shared duplexer 5_8 and antenna 5_9；Transmitting path further includes being linked in sequence
First DAC(digital analog converter) 5_6, the first frequency mixer 5_7；The input terminal connection of first DAC5_6 the first number letter
The output end of number processing module 5_5；Receiving path further includes the second frequency mixer 5_10 being linked in sequence, the 2nd ADC(analog-to-digital conversion
Device) 5_11.Wherein the input terminal of the first digital signal processing module 5_5 connects the 2nd ADC(analog-digital converter) 5_
11 output end.Wherein the intermediate frequency digital electric signal from the first digital signal processing module 5_5 is converted to by the 2nd ADC5_11
Analog intermediate frequency signal, then by the second frequency mixer 5_10 analog intermediate frequency signal up-conversion to radiofrequency signal, it finally will by antenna 5_9
Radiofrequency signal is sent to the second radio receiving transmitting module 2a_1, while receiving the control letter from the second radio receiving transmitting module 2a_1
Number.
Fig. 6 provides a kind of specific implementation of the second radio receiving transmitting module 2a_1, with aforementioned first wireless receiving and dispatching
Module is similar, and in Fig. 6, the transmitting path and receiving path of the second radio receiving transmitting module 2a_1 includes shared duplexer
And antenna；Transmitting path further include be linked in sequence the first DAC(digital analog converter), the first frequency mixer；First DAC's is defeated
Enter the output end that end connects first digital signal processing module.Receiving path further include be linked in sequence the second frequency mixer,
2nd ADC(analog-digital converter)；Wherein the input terminal of first digital signal processing module connects the 2nd ADC(modulus
Converter) output end, the intermediate frequency digital electric signal from the first digital signal processing module is converted to intermediate frequency mould by the 2nd ADC
Quasi- signal, then by the second frequency mixer analog intermediate frequency signal up-conversion to radiofrequency signal, finally by antenna by emission of radio frequency signals.
Antenna receives the radiofrequency signal from the first radio receiving transmitting module, is downconverted to radiofrequency signal by the second frequency mixer
Intermediate-freuqncy signal recycles the 2nd ADC that analog intermediate frequency signal is converted to digital signal and is sent to the second digital signal processing module,
And to the first radio receiving transmitting module emissioning controling signal.
In the specific embodiment that Fig. 6 is provided, the second sound acquisition module 2b_3 and the first sound acquisition module class
Seemingly, the microphone including sequential connection, sound pick-up/filter, the first ADC and speech coder, institute's speech encoder it is defeated
Outlet connects the input terminal of the second digital signal processing module.The major function of the second sound acquisition module 2b_3 is to biography
It is acquired, and is pre-processed to sound-source signal outdoors.
Second digital signal processing module saves preset sound pressure level strength value, and according to second sound acquisition module
The acoustic information that 2b_3 is sent is compared with preset sound pressure level strength value, and whether control masking sound generation module 2b_1 generates
Sound masking signal, and the sound of the strength control sound masking signal according to the second sound acquisition module 2b_3 voice signal sent
Intensity, in addition, if the acoustic information that second sound acquisition module 2b_3 is sent is lower than preset sound pressure level strength value, control second
Radio receiving transmitting module 2b_1 emits signal to the first radio receiving transmitting module, and sound source is made to acquire attachment break-off.There are also to second
Radio receiving transmitting module 2a_1 and masking sound generation module 2b_1 carries out initialization and corresponding configuration, realizes and generates masking sound telecommunications
Number the algorithm algorithm of masking sound (generate provided subsequent), and send the masking acoustoelectric signal of generation to masking sound and generate mould
Block.
The masking sound generation module 2b_1 includes the Voice decoder 6_1 being linked in sequence, the 2nd DAC6_2, power amplification
Device 6_3 and loudspeaker 6_4, the input terminal of the output end connection Voice decoder 6_1 of the second digital signal processing module.Its
In, Voice decoder 6_1 carries out tone decoding to masking acoustoelectric signal, then digital signal is converted to mould by the 2nd DAC 6_2
Onomatopoeia sound signal, then power amplification, finally the covering generation by loudspeaker 6_4 are carried out by power amplifier 6_3 sound masking signal
Acoustical signal is covered to play out.
A kind of sound masking signal generating algorithm based on time reversal is given below, which can be with the shape of software program
Formula is pre-stored in the second digital signal processing module.
Step 1: obtained target sound source signal being pre-processed, pretreatment includes: that speech enhan-cement, noise reduction, sound source are fixed
Position and sound characteristic identification.Clean target sound source signal is obtained by pretreatment；
Step 2: the target sound source signal that step 1 is obtained carries out framing by specific time window length, it is assumed that sound-source signal
A certain frame signal after framing isx(t), corresponding Fourier transformation is
(1)
Wherein G is the amplitude information on signal frequency domain, and j indicates imaginary unit.
It is to the sound masking signal for obtaining target sound source after the time reversal of each frame signal progress time domain according to (2) formula
(2)
Sound masking signaly(t) corresponding Fourier transformation is
(3)
By (3) formula it is found that the reversion in time domain does not have an impact for the amplitude spectrum of signal.For human ear, the time
When inverting the sound masking signal generated together with sound-source signal aliasing, have no idea in the information of sound masking signal itself by people
In the case where understanding, masking effect will be generated to sound-source signal.When the length of voice signal framing is selected as 180ms-500ms
When, do not have original speech information by the sound masking signal of time reversal and there is uniformity.
The more specific embodiment of the present invention is given below:
The schematic diagram that sound masking signal generates process is as shown in Figure 7.It is divided into 3 width waveform diagrams, the first width in Fig. 7 from top to bottom
Figure is one section of primary speech signal, this section of material 8 seconds in total.According to time reversal algorithm, when being carried out first to source voice messaging
Sub-frame processing on domain takes 1 second for the ease of observation frame length；Then the reversion in time domain is carried out to each frame signal, i.e., such as the
Shown in two width figures；Since sound masking signal is one frame sound-source signal of system acquisition and is pre-processed to obtain to it, so this
The sound masking signal that frame sound-source signal generates cannot shelter this frame signal, can only shelter to the frame after it.?
Here we only illustrate to shelter the next frame of sound-source signal, i.e., as shown in third width figure.
First sound acquisition module 4_1 and second sound acquisition module 2b_3 of the present invention can use
TLV320AIC23 chip is realized.TLV320AIC23 is a high performance stereo audio Codec chip that TI is released, and right
Outputting and inputting all there is programmable-gain to adjust, and meet needs of the invention.The analog-to-digital conversion (ADCS) of TLV320AIC23 and
Digital-to-analogue conversion (DACS) component height is integrated in chip interior, uses advanced Sigma-delta oversampling technique, Ke Yi
The sampling of 16bit, 20bit, 24bit and 32bit, the output signal-to-noise ratio point of ADC and DAC are provided in the frequency range of 8k to 96k
90dB and 100dB are not can achieve.TLV320AIC23 also has very low energy consumption, and power is only 23mW, power saving under playback mode
It is even more to be less than 15uW under mode.
First radio receiving transmitting module 4_3 of the present invention and the second radio receiving transmitting module 2a_1 utilizes nRF240l chip
And dual-mode antenna is realized.NRF240l wireless receiving and dispatching one chip operation can adapt to wireless market in the free frequency range of 2.4GHZ
Requirement to frequency range.NRF240l supports multi-point communication, and maximum transmission rate is more than lMbit/s, and BELAND toilet article have it is higher
Transmission speed.It is designed using SOC method, only needs a small amount of peripheral cell that can form RF transmit-receive circuit.
First digital signal processing module 4_1 of the present invention and the second digital signal processing module 2b_2 is utilized
TMS320VC5509DSP is realized.TMS320VC5509 is the first item released in recent years of TI company to reduce the height based on power consumption
Fast dsp chip, core voltage are only 1.5V, and TMS320C5509 has multiple interfaces, while can configure large capacity
SDRAM。
Realize the connection schematic diagram of sound source acquisition attachment of the present invention as shown in figure 8, using said chip with said chip
Realize that the connection schematic diagram of sound masking door main body of the present invention is as shown in Figure 9.
Disclosed in this invention embodiment description method or the step of algorithm can directly use hardware, processor execution
Software module or the combination of the two implement.Software module can be placed in random access memory (RAM), memory, read-only storage
Device (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology neck
In any other form of storage medium well known in domain.
Previously described is each preferred embodiment of the invention, if the preferred embodiment in each preferred embodiment
It is not obvious contradictory or premised on a certain preferred embodiment, each preferred embodiment can any stack combinations
Use, the design parameter in the embodiment and embodiment only for the purpose of clearly stating the inventor's invention verification process, and
It is non-to limit scope of patent protection of the invention, scope of patent protection of the invention is still subject to the claims, all
It is that similarly should be included in protection model of the invention with the variation of equivalent structure made by specification and accompanying drawing content of the invention
In enclosing.
Claims (8)
1. a kind of sound masking door, including sound masking door main body, which is characterized in that further include moveable sound source acquisition attachment, institute
State sound source acquisition attachment include the first sound acquisition module, the first radio receiving transmitting module and with the first sound acquisition module and the
The first digital signal processing module that one radio receiving transmitting module is connected；
The sound masking door main body include towards on the inside of door-plate or doorframe the second radio receiving transmitting module, towards outside door-plate or doorframe
The masking sound generation module of side, and the second number being connected with above-mentioned second radio receiving transmitting module and masking sound generation module
Signal processing module；
First sound acquisition module emits the voice signal of acquisition by the first radio receiving transmitting module, the second radio receiving transmitting module
It receives the voice signal of the first radio receiving transmitting module transmitting and masking sound telecommunications is generated by the second digital signal processing module
Number it is transferred to masking sound generation module；Masking sound generation module shelters acoustoelectric signal based on the received and generates masking sound；
It further include the second sound acquisition module being connect with the second digital signal processing module, the second Digital Signal Processing mould
Block receives the voice signal of second sound acquisition module acquisition, and controls masking sound according to the sound signal intensity of acquisition and generate mould
The intensity of block generation sound masking signal；
Second digital signal processing module receives the voice signal of second sound acquisition module acquisition, and according to the sound of acquisition
Sound signal intensity, to the first radio receiving transmitting module emissioning controling signal, is controlled sound source and acquires attachment by the second radio receiving transmitting module
Whether work.
2. sound masking door as described in claim 1, which is characterized in that sound acquisition module includes the microphone being linked in sequence, pickup
The output end of device or filter, the first ADC and speech coder, institute's speech encoder connects digital signal processing module.
3. sound masking door as described in claim 1, which is characterized in that the radio receiving transmitting module includes transmitting path and receives logical
Road, the transmitting path and receiving path include common antenna and the duplexer that connect with antenna.
4. sound masking door as claimed in claim 3, which is characterized in that the transmitting path further includes that the first DAC is mixed with first
Device, first mixer output connect duplexer, and the first DAC input terminal connects digital signal processing module, described
The output end of first DAC connects the input terminal of the first frequency mixer.
5. sound masking door as claimed in claim 3, which is characterized in that the receiving path further includes the mixing of the 2nd ADC and second
Device, the output end of the 2nd ADC connect digital signal processing module, and the input terminal of second frequency mixer connects duplexer,
The output end of second frequency mixer connects the input terminal of the 2nd ADC.
6. sound masking door as described in claim 1, which is characterized in that the masking sound generation module includes the voice being linked in sequence
The input terminal of decoder, the 2nd DAC, power amplifier and loudspeaker, Voice decoder connects the second Digital Signal Processing mould
Block.
7. sound masking door as described in claim 1, which is characterized in that second digital signal processing module is according to from the second nothing
The sound-source signal for the first sound acquisition module acquisition that line transceiver module receives generates the detailed process of masking acoustoelectric signal are as follows:
Step 1: obtained voice signal is obtained into target sound source signal by pretreatment；It is described pretreatment include: speech enhan-cement,
Noise reduction, auditory localization and sound characteristic identification；
Step 2: the target sound source signal that step 1 is obtained carries out framing by preset time window length, according to；
Sound masking signal is obtained after the time reversal for carrying out time domain to each frame signal.
8. sound masking door as described in claim 1, which is characterized in that the sound masking door have following characteristics at least within it
One:
A. the sound acquisition module is realized using TLV320AIC23；
B. the digital signal processing module is realized using TMS320VC5509；
C. the radio receiving transmitting module is nRF240l chip and the antenna connecting with nRF240l chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510484967.6A CN105185370B (en) | 2015-08-10 | 2015-08-10 | A kind of sound masking door |
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|---|---|---|---|
| CN201510484967.6A CN105185370B (en) | 2015-08-10 | 2015-08-10 | A kind of sound masking door |
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| CN105185370B true CN105185370B (en) | 2019-02-12 |
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| CN201510484967.6A Expired - Fee Related CN105185370B (en) | 2015-08-10 | 2015-08-10 | A kind of sound masking door |
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| CN112216263A (en) * | 2020-10-09 | 2021-01-12 | 杭州海泰电子有限公司 | Sound masking system for office area |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110441A (en) * | 2010-12-22 | 2011-06-29 | 中国科学院声学研究所 | Method for generating sound masking signal based on time reversal |
| CN202383998U (en) * | 2011-12-22 | 2012-08-15 | 国家保密科学技术研究所 | Sound masking system |
| JP2012194528A (en) * | 2010-11-25 | 2012-10-11 | Yamaha Corp | Masker sound generation device, storage medium which stores masker sound signal, masker sound player device, and program |
| CN103650533A (en) * | 2011-06-07 | 2014-03-19 | 高通股份有限公司 | Generating a masking signal on an electronic device |
| CN104575486A (en) * | 2014-12-25 | 2015-04-29 | 中国科学院信息工程研究所 | Sound leakage protection method and system based on sound masking principle |
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| US9361903B2 (en) * | 2013-08-22 | 2016-06-07 | Microsoft Technology Licensing, Llc | Preserving privacy of a conversation from surrounding environment using a counter signal |
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| CN103650533A (en) * | 2011-06-07 | 2014-03-19 | 高通股份有限公司 | Generating a masking signal on an electronic device |
| CN202383998U (en) * | 2011-12-22 | 2012-08-15 | 国家保密科学技术研究所 | Sound masking system |
| CN104685560A (en) * | 2012-09-25 | 2015-06-03 | 雅马哈株式会社 | Method, device, and program for voice masking |
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